WN Flange Product Name: Weld neck flange Size: 1/2"-24" Pressure Class: 150 -2500Lbs Material F316/F304/F316L/F304L/A105 /F5/F11/F22 15CrMo,12CrMoV,Q235,16Mn,20#, etc Staindard:ANSI B16.5 Big Diameter: ASME B16.47 Other standards: DIN/BS/JIS/UNI